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~~ Banks and Gesso, LLC <br />~~ <br />August 29, 2003 <br />Ms. Erica S. Crosby <br />Environmental Protection Specialist <br />Colorado Division of Minerals and Geology <br />1313 Sherman Street, Room 215 <br />Denver, Colorado 80203 <br />720 Kipling St.,Suite117 <br />Lakewood, Colorado 80215 <br />(303)274-4277 <br />Fax (303) 274-8329 <br />www. ba n ksan dgesso. co m <br />RE: Cemex, Inc.; Lyons Quarry, Permit No. M-1977-208 <br />Technical Revision 02; Response to 3`d Adequacy Letter <br />Dear Erica: <br />This letter is in response to your 3rd Adequacy Letter dated August 26, 2003 for the Lyons Quarry. <br />The Division has requested additional information regarding the riprap ditch terminus pad, and the <br />estimated volume of water to be diverted to this structure. <br />As stated in the original Request for Technical Revision, dated May 28, 2003, the proposed diversion <br />ditch will be constructed for the purpose of routing surface drainage around the disposal area. These <br />channels will be installed prior to construction of the disposal area and will remain in place after final <br />vegetation. <br />The area on which the disposal area is to be located is flat, and the proposed diversion ditch will not <br />divert water from existing or natural drainages in the area. The ditch will serve to isolate the disposal <br />cell by carrying stormwater runoff away from the cell and preventing overland flows from ponding at the <br />cell edges. The disposal cell is to be vegetated and will have a low runoff coefficient; therefore the <br />amount of water to be carried by the proposed ditch is expected to be minimal, as it will consists only of <br />localized runoff. <br />The purpose of the terminus pad is to slow and spread the small volume of runoff resulting from <br />infrequent storm events. This will prevent potential localized erosion and aid in distributing the <br />stormwater runoff. It is not expected that any significant ponding of water will occur, as the resulting <br />sheet flow will be absorbed by evaporation and soil percolation. <br />Please let me know if you require additional information to approve this Technical Revision. Thank you. <br />Sincerely, <br />Maureen Jacoby C~~~ V <br />RECEIVED <br />SEP 0 2 2Qt~3 <br />cc: John Lohr, Cemex, Inc. <br />Division of Minerals and Geology <br />